Spark-arrester



(No Model.)

H. 0. SMITH.

SPARK ARRESTER. I No. 478,207. Patented July 5, 1892.

Vii/$11,655 HENRY 0. SMITH,

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UNITED STATES P TENT OFFICE.

HENRY 0. SMITH, OF ROANOKE, VIRGINIA.

SPARK-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 478,207, dated July 5,1892.

Application filed March 10, 1892. Serial No. 424,408. (No model.)

To all whom it may concern:

Be it known that I, HENRY 0. SMITH, a citizen ofthe United States,residing at Roanoke, in the county of Roanoke and State of Virginia,have invented certain new and useful Improvements in Spark-Arresters, ofwhich the following is a specification.

My invention relates to spark-arresters; and it consists in the variousdetails hereinafter set forth and claimed.

The object of my invention is to obtain an efficient spark-arresterwhich shall be simple in construction and at the same time will notmaterially retard the draft'of the engine or boiler to which it isapplied.

The annexed drawing represents a vertical sectional view of my improveddevice.

A indicates the main body or conical part of a smoke-stack, to which issecured by means of bolts or rivets a an inwardlycurved cast-iron rim orhood B; and upon this hood is mounted a flanged ring or band 0.

Between the hood Baud bahd G, *I secure my spark deflectors or screens Dand E, the former of which is in the form of an inverted cone and thelatter a frustum of a cone, both being formed of wire-netting or similarmaterial and having their outer edges clamped between the hoodB and band0.

The lower edge of the screen or deflector E is stiffened or strengthenedby means of a wire or band 0, as shown, as this is the screen which issubjected to the greatest force and wear.

Suspended Within the stack by means of the bolts or rods 1) b is aninverted-sheet-metal cone or receptacle F,its base being in nearly thesame horizontal plane as'the apex of the deflector D and equal indiameter to the said deflector. Extending through the side of the stackand communicating with the small end of the coneF is a pipe G, which isadapted to arrest the cinders, but does not materially iatfectthe-draft, which has a direct outlet through screen D and ring C. Suchcinders as are not caught by the screen E will be stopped by the screenD, screen E serving to arrest those cinders which are thrown upward withthe most force. The cinders which are arrested by the screens D and Efall into the receiving-cone F, from which they are carried off throughthe pipe G and discharged, while the smoke and gases pass through thescreens and finally escape through the top of the stack.

I desire to emphasize the fact that while the short screen or deflectorE causes a deflection of the ascending cinders, sparks, &c., andrelieves the screen D from considerable work it does not to any materialdegree interfere with the draft and cause back-pressure.

While I prefer to make the shells A F and the screen D of conical form,this is not essential; noris the precise manner of securing the screensin place of particular moment.

I am aware that spark-arresters have been provided with imperforatedeflectors designed to receive the initial impact of the draft, and tosuch construction I make no claim. My invention comprises a screeningdeflector which, while saving the main screen from the initial impact,allows the smoke and gases to escape directly from the stack withoutappreciably affecting the draft, as invariably occurs where imperforatedeflectors are used.

Having thus described my invention, what I claim is 1.Inaspark-arrester, the combination,with the stack A, of a receptacle F,open at its upper end and located within the stack, a screen D,extending across the top of the stack immediately above the mouth of thereceptacle, so as to direct the sparks thereinto, and adeflecting-screen E, surrounding that portion of the screen D above theannular spaoebetween the parts A and F, all substantially as shown anddescribed.

2. In a spark-arrester, the combination,with 9 5 a stack A, of areceptacle mountedtherein, but set away from the sides thereof, so as toform an annular draft-space, a conical screen D, extending across theoutlet of the stack and projecting down toward the mouth of thereceptacle F, and a second screen E, made in the form of a ring or bandand adapted to reoeive the initial impact; of the draft, the.

3. In combination with stack A, having curved upper Wall or casting B,receptacle F, mounted therein and having its upper end of the same sizeas the opening in the top of the stack, the conical screen D, fillingthe opening in the stack-opening and extending down 10 toward the mouthof the receptacle, and a second screen E, made in the form of a band andsurrounding the screen D near its junction with the stack.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

HENRY 0. SMITH.

\Vitnesses: .T. W. SHIELD, J r., JOHN THos. TRAUT.

